[NETLINK]: Make use of NLA_STRING/NLA_NUL_STRING attribute validation

Converts existing NLA_STRING attributes to use the new
validation features, saving a couple of temporary buffers.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/fib6_rules.c b/net/ipv6/fib6_rules.c
index 2fbc71d..34f5bfa 100644
--- a/net/ipv6/fib6_rules.c
+++ b/net/ipv6/fib6_rules.c
@@ -137,10 +137,10 @@
 }
 
 static struct nla_policy fib6_rule_policy[FRA_MAX+1] __read_mostly = {
-	[FRA_IFNAME]	= { .type = NLA_STRING },
+	[FRA_IFNAME]	= { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
 	[FRA_PRIORITY]	= { .type = NLA_U32 },
-	[FRA_SRC]	= { .minlen = sizeof(struct in6_addr) },
-	[FRA_DST]	= { .minlen = sizeof(struct in6_addr) },
+	[FRA_SRC]	= { .len = sizeof(struct in6_addr) },
+	[FRA_DST]	= { .len = sizeof(struct in6_addr) },
 	[FRA_FWMARK]	= { .type = NLA_U32 },
 	[FRA_FWMASK]	= { .type = NLA_U32 },
 	[FRA_TABLE]	= { .type = NLA_U32 },